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 ###Instrução: Quais repórteres de campo trabalharam ao lado de Frank Gifford e Dan Dierdorf?
 ###Tabelas: CREATE TABLE winners_of_the_virginia_derby_since_1998 (winners_of_the_virginia_derby_since_1998_id AUTO_INCREMENT PRIMARY KEY, Year INT, Winner VARCHAR, Jockey VARCHAR, Trainer VARCHAR, Owner VARCHAR, Distance (Miles) VARCHAR, Time VARCHAR) CREATE TABLE group_c (group_c_id AUTO_INCREMENT PRIMARY KEY, Home team VARCHAR, Home team score VARCHAR, Away team VARCHAR, Away team score VARCHAR, Ground VARCHAR, Crowd INT, Date VARCHAR) CREATE TABLE new_york_counties_ranked_by_per_capita_income (new_york_counties_ranked_by_per_capita_income_id AUTO_INCREMENT PRIMARY KEY, County VARCHAR, Per capita income VARCHAR, Median household income VARCHAR, Median family income VARCHAR, Population INT, Number of households INT) CREATE TABLE 1850s (1850s_id AUTO_INCREMENT PRIMARY KEY, Year INT, Number of tropical storms INT, Number of hurricanes INT, Number of major hurricanes INT, Deaths VARCHAR, Strongest storm VARCHAR) CREATE TABLE 1990s (1990s_id AUTO_INCREMENT PRIMARY KEY, Year INT, Network VARCHAR, Play-by-play VARCHAR, Color commentator(s) VARCHAR, Sideline reporter(s) VARCHAR)  
SELECT Sideline reporter(s) FROM 1990s WHERE Color commentator(s) = frank gifford and dan dierdorf